Hi Daniel,
Greetings from Syncfusion support.
Query: SubTotal, Tax, and Total, those columns must be
calculated when the user types in the cost or quantity column
From your shared information we identified that you want to
automatically update the column based on another column's edited value. We have
already discussed the same in the below documentation which contains the code
example. Please refer to the below documentation for more details.
Automatically update the column based on another column
edited value: https://ej2.syncfusion.com/aspnetmvc/documentation/grid/editing/in-line-editing#automatically-update-the-column-based-on-another-column-edited-value
Please feel free to contact us if you require any further
assistance. We are always available and eager to help you in any way we can.
Regards,
Hemanth Kumar S